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[61.228.52.13]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38dc9fc78ffsm269900a91.9.2026.07.10.20.37.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jul 2026 20:37:35 -0700 (PDT) From: Shih-Yuan Lee To: Henrik Rydberg , Guenter Roeck Cc: Armin Wolf , linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, Shih-Yuan Lee Subject: [PATCH v2 1/1] hwmon: (applesmc) Convert to hwmon_device_register_with_info Date: Sat, 11 Jul 2026 11:37:00 +0800 Message-Id: <20260711033700.3693-2-fourdollars@debian.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260711033700.3693-1-fourdollars@debian.org> References: <20260710123236.10508-1-fourdollars@debian.org> <20260711033700.3693-1-fourdollars@debian.org> Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The legacy hwmon_device_register() function is deprecated and triggers a warning in dmesg during driver initialization. Convert the driver to use the modern hwmon_device_register_with_info() API. This migration moves the registration of standard sensor attributes to the HWMON core: - Standard temperature attributes (temp*_input, temp*_label) are mapped to hwmon_temp channels. - Standard fan attributes (fan*_input, fan*_label, fan*_min, fan*_max) are mapped to hwmon_fan channels. - Non-standard fan*_output is renamed to standard fan*_target and mapped to HWMON_F_TARGET. - Non-standard fan*_manual is renamed to standard pwm*_enable and mapped to HWMON_PWM_ENABLE. - The remaining non-standard fan*_safe attribute is dynamically created and registered via extra_groups. To support the read_string callback for fan labels, load and cache the fan position names in smcreg.fan_positions during register initialization. Finally, clean up the now-unused static attributes (temp_group, fan_group) and their corresponding show/store callback functions to prevent compiler warnings about unused static symbols. Signed-off-by: Shih-Yuan Lee --- drivers/hwmon/applesmc.c | 458 ++++++++++++++++++++++++++------------- 1 file changed, 309 insertions(+), 149 deletions(-) diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c index 90a14a7f2c4c..3470912649c4 100644 --- a/drivers/hwmon/applesmc.c +++ b/drivers/hwmon/applesmc.c @@ -133,6 +133,7 @@ static struct applesmc_registers { bool init_complete; /* true when fully initialized */ struct applesmc_entry *cache; /* cached key entries */ const char **index; /* temperature key index */ + char fan_positions[10][17]; /* cached fan position labels */ } smcreg = { .mutex = __MUTEX_INITIALIZER(smcreg.mutex), }; @@ -566,7 +567,7 @@ static int applesmc_init_smcreg_try(void) { struct applesmc_registers *s = &smcreg; bool left_light_sensor = false, right_light_sensor = false; - unsigned int count; + unsigned int count, i; u8 tmp[1]; int ret; @@ -597,6 +598,16 @@ static int applesmc_init_smcreg_try(void) if (s->fan_count > 10) s->fan_count = 10; + for (i = 0; i < s->fan_count; i++) { + char newkey[5]; + + scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, i); + ret = applesmc_read_key(newkey, s->fan_positions[i], 16); + s->fan_positions[i][16] = 0; + if (ret) + scnprintf(s->fan_positions[i], 17, "Fan %d", i); + } + ret = applesmc_get_lower_bound(&s->temp_begin, "T"); if (ret) return ret; @@ -808,33 +819,6 @@ static ssize_t applesmc_light_show(struct device *dev, return sysfs_emit(sysfsbuf, "(%d,%d)\n", left, right); } -/* Displays sensor key as label */ -static ssize_t applesmc_show_sensor_label(struct device *dev, - struct device_attribute *devattr, char *sysfsbuf) -{ - const char *key = smcreg.index[to_index(devattr)]; - - return sysfs_emit(sysfsbuf, "%s\n", key); -} - -/* Displays degree Celsius * 1000 */ -static ssize_t applesmc_show_temperature(struct device *dev, - struct device_attribute *devattr, char *sysfsbuf) -{ - const char *key = smcreg.index[to_index(devattr)]; - int ret; - s16 value; - int temp; - - ret = applesmc_read_s16(key, &value); - if (ret) - return ret; - - temp = 250 * (value >> 6); - - return sysfs_emit(sysfsbuf, "%d\n", temp); -} - static ssize_t applesmc_show_fan_speed(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { @@ -854,99 +838,6 @@ static ssize_t applesmc_show_fan_speed(struct device *dev, return sysfs_emit(sysfsbuf, "%u\n", speed); } -static ssize_t applesmc_store_fan_speed(struct device *dev, - struct device_attribute *attr, - const char *sysfsbuf, size_t count) -{ - int ret; - unsigned long speed; - char newkey[5]; - u8 buffer[2]; - - if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000) - return -EINVAL; /* Bigger than a 14-bit value */ - - scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)], - to_index(attr)); - - buffer[0] = (speed >> 6) & 0xff; - buffer[1] = (speed << 2) & 0xff; - ret = applesmc_write_key(newkey, buffer, 2); - - if (ret) - return ret; - else - return count; -} - -static ssize_t applesmc_show_fan_manual(struct device *dev, - struct device_attribute *attr, char *sysfsbuf) -{ - int ret; - u16 manual = 0; - u8 buffer[2]; - - ret = applesmc_read_key(FANS_MANUAL, buffer, 2); - if (ret) - return ret; - - manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01; - return sysfs_emit(sysfsbuf, "%d\n", manual); -} - -static ssize_t applesmc_store_fan_manual(struct device *dev, - struct device_attribute *attr, - const char *sysfsbuf, size_t count) -{ - int ret; - u8 buffer[2]; - unsigned long input; - u16 val; - - if (kstrtoul(sysfsbuf, 10, &input) < 0) - return -EINVAL; - - ret = applesmc_read_key(FANS_MANUAL, buffer, 2); - if (ret) - goto out; - - val = (buffer[0] << 8 | buffer[1]); - - if (input) - val = val | (0x01 << to_index(attr)); - else - val = val & ~(0x01 << to_index(attr)); - - buffer[0] = (val >> 8) & 0xFF; - buffer[1] = val & 0xFF; - - ret = applesmc_write_key(FANS_MANUAL, buffer, 2); - -out: - if (ret) - return ret; - else - return count; -} - -static ssize_t applesmc_show_fan_position(struct device *dev, - struct device_attribute *attr, char *sysfsbuf) -{ - int ret; - char newkey[5]; - u8 buffer[17]; - - scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr)); - - ret = applesmc_read_key(newkey, buffer, 16); - buffer[16] = 0; - - if (ret) - return ret; - - return sysfs_emit(sysfsbuf, "%s\n", buffer + 4); -} - static ssize_t applesmc_calibrate_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { @@ -1094,22 +985,7 @@ static struct applesmc_node_group light_sensor_group[] = { { } }; -static struct applesmc_node_group fan_group[] = { - { "fan%d_label", applesmc_show_fan_position }, - { "fan%d_input", applesmc_show_fan_speed, NULL, 0 }, - { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 }, - { "fan%d_max", applesmc_show_fan_speed, NULL, 2 }, - { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 }, - { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 }, - { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual }, - { } -}; -static struct applesmc_node_group temp_group[] = { - { "temp%d_label", applesmc_show_sensor_label }, - { "temp%d_input", applesmc_show_temperature }, - { } -}; /* Module stuff */ @@ -1307,8 +1183,217 @@ static const struct dmi_system_id applesmc_whitelist[] __initconst = { }; MODULE_DEVICE_TABLE(dmi, applesmc_whitelist); +static struct applesmc_dev_attr *fan_safe_attrs; +static struct attribute **fan_safe_attr_list; +static struct attribute_group fan_safe_group; +static const struct attribute_group *applesmc_extra_groups[2]; + +static umode_t applesmc_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_input || attr == hwmon_temp_label) + return 0444; + break; + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: + case hwmon_fan_label: + case hwmon_fan_max: + return 0444; + case hwmon_fan_min: + case hwmon_fan_target: + return 0644; + default: + break; + } + break; + case hwmon_pwm: + if (attr == hwmon_pwm_enable) + return 0644; + break; + default: + break; + } + return 0; +} + +static int applesmc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + int ret; + + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_input) { + const char *key = smcreg.index[channel]; + s16 value; + + ret = applesmc_read_s16(key, &value); + if (ret) + return ret; + *val = 250 * (value >> 6); + return 0; + } + break; + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: { + char key[5]; + u8 buffer[2]; + + scnprintf(key, sizeof(key), "F%dAc", channel); + ret = applesmc_read_key(key, buffer, 2); + if (ret) + return ret; + *val = ((buffer[0] << 8 | buffer[1]) >> 2); + return 0; + } + case hwmon_fan_min: { + char key[5]; + u8 buffer[2]; + + scnprintf(key, sizeof(key), "F%dMn", channel); + ret = applesmc_read_key(key, buffer, 2); + if (ret) + return ret; + *val = ((buffer[0] << 8 | buffer[1]) >> 2); + return 0; + } + case hwmon_fan_max: { + char key[5]; + u8 buffer[2]; + + scnprintf(key, sizeof(key), "F%dMx", channel); + ret = applesmc_read_key(key, buffer, 2); + if (ret) + return ret; + *val = ((buffer[0] << 8 | buffer[1]) >> 2); + return 0; + } + case hwmon_fan_target: { + char key[5]; + u8 buffer[2]; + + scnprintf(key, sizeof(key), "F%dTg", channel); + ret = applesmc_read_key(key, buffer, 2); + if (ret) + return ret; + *val = ((buffer[0] << 8 | buffer[1]) >> 2); + return 0; + } + default: + break; + } + break; + case hwmon_pwm: + if (attr == hwmon_pwm_enable) { + u8 buffer[2]; + + ret = applesmc_read_key(FANS_MANUAL, buffer, 2); + if (ret) + return ret; + *val = ((buffer[0] << 8 | buffer[1]) >> channel) & 0x01; + return 0; + } + break; + default: + break; + } + return -EOPNOTSUPP; +} + +static int applesmc_hwmon_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + int ret; + + switch (type) { + case hwmon_fan: + if (attr == hwmon_fan_min || attr == hwmon_fan_target) { + char key[5]; + u8 buffer[2]; + const char *fmt = (attr == hwmon_fan_min) ? "F%dMn" : "F%dTg"; + + if (val < 0 || val >= 0x4000) + return -EINVAL; + scnprintf(key, sizeof(key), fmt, channel); + buffer[0] = (val >> 6) & 0xff; + buffer[1] = (val << 2) & 0xff; + return applesmc_write_key(key, buffer, 2); + } + break; + case hwmon_pwm: + if (attr == hwmon_pwm_enable) { + u8 buffer[2]; + u16 manual_val; + + if (val != 0 && val != 1) + return -EINVAL; + mutex_lock(&smcreg.mutex); + ret = applesmc_read_key(FANS_MANUAL, buffer, 2); + if (ret) + goto out_unlock; + manual_val = (buffer[0] << 8 | buffer[1]); + if (val) + manual_val |= (0x01 << channel); + else + manual_val &= ~(0x01 << channel); + buffer[0] = (manual_val >> 8) & 0xff; + buffer[1] = manual_val & 0xff; + ret = applesmc_write_key(FANS_MANUAL, buffer, 2); +out_unlock: + mutex_unlock(&smcreg.mutex); + return ret; + } + break; + default: + break; + } + return -EOPNOTSUPP; +} + +static int applesmc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_label) { + *str = smcreg.index[channel]; + return 0; + } + break; + case hwmon_fan: + if (attr == hwmon_fan_label) { + *str = smcreg.fan_positions[channel] + 4; + return 0; + } + break; + default: + break; + } + return -EOPNOTSUPP; +} + +static const struct hwmon_ops applesmc_hwmon_ops = { + .is_visible = applesmc_hwmon_is_visible, + .read = applesmc_hwmon_read, + .write = applesmc_hwmon_write, + .read_string = applesmc_hwmon_read_string, +}; + static int __init applesmc_init(void) { + u32 *temp_config; + u32 *fan_config; + u32 *pwm_config; + struct hwmon_channel_info *info_temp; + struct hwmon_channel_info *info_fan; + struct hwmon_channel_info *info_pwm; + const struct hwmon_channel_info **info; + struct hwmon_chip_info *chip; + int i; int ret; if (!dmi_check_system(applesmc_whitelist)) { @@ -1343,17 +1428,97 @@ static int __init applesmc_init(void) if (ret) goto out_smcreg; - ret = applesmc_create_nodes(fan_group, smcreg.fan_count); - if (ret) + /* allocate hwmon channel configs */ + temp_config = devm_kcalloc(&pdev->dev, smcreg.index_count + 1, + sizeof(*temp_config), GFP_KERNEL); + fan_config = devm_kcalloc(&pdev->dev, smcreg.fan_count + 1, + sizeof(*fan_config), GFP_KERNEL); + pwm_config = devm_kcalloc(&pdev->dev, smcreg.fan_count + 1, + sizeof(*pwm_config), GFP_KERNEL); + if (!temp_config || !fan_config || !pwm_config) { + ret = -ENOMEM; goto out_info; + } - ret = applesmc_create_nodes(temp_group, smcreg.index_count); - if (ret) - goto out_fans; + for (i = 0; i < smcreg.index_count; i++) + temp_config[i] = HWMON_T_INPUT | HWMON_T_LABEL; + temp_config[smcreg.index_count] = 0; + + for (i = 0; i < smcreg.fan_count; i++) { + fan_config[i] = HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | + HWMON_F_MAX | HWMON_F_TARGET; + pwm_config[i] = HWMON_PWM_ENABLE; + } + fan_config[smcreg.fan_count] = 0; + pwm_config[smcreg.fan_count] = 0; + + info_temp = devm_kzalloc(&pdev->dev, sizeof(*info_temp), GFP_KERNEL); + info_fan = devm_kzalloc(&pdev->dev, sizeof(*info_fan), GFP_KERNEL); + info_pwm = devm_kzalloc(&pdev->dev, sizeof(*info_pwm), GFP_KERNEL); + if (!info_temp || !info_fan || !info_pwm) { + ret = -ENOMEM; + goto out_info; + } + + info_temp->type = hwmon_temp; + info_temp->config = temp_config; + + info_fan->type = hwmon_fan; + info_fan->config = fan_config; + + info_pwm->type = hwmon_pwm; + info_pwm->config = pwm_config; + + info = devm_kcalloc(&pdev->dev, 4, sizeof(*info), GFP_KERNEL); + if (!info) { + ret = -ENOMEM; + goto out_info; + } + + info[0] = info_temp; + info[1] = info_fan; + info[2] = info_pwm; + info[3] = NULL; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) { + ret = -ENOMEM; + goto out_info; + } + + chip->ops = &applesmc_hwmon_ops; + chip->info = info; + + /* Create non-standard fanX_safe attributes group */ + fan_safe_attrs = devm_kcalloc(&pdev->dev, smcreg.fan_count, + sizeof(*fan_safe_attrs), GFP_KERNEL); + fan_safe_attr_list = devm_kcalloc(&pdev->dev, smcreg.fan_count + 1, + sizeof(*fan_safe_attr_list), GFP_KERNEL); + if (!fan_safe_attrs || !fan_safe_attr_list) { + ret = -ENOMEM; + goto out_info; + } + + for (i = 0; i < smcreg.fan_count; i++) { + struct applesmc_dev_attr *node = &fan_safe_attrs[i]; + + scnprintf(node->name, sizeof(node->name), "fan%d_safe", i + 1); + node->sda.index = (3 << 16) | (i & 0xffff); /* Option 3 (safe speed) */ + node->sda.dev_attr.show = applesmc_show_fan_speed; + node->sda.dev_attr.store = NULL; + sysfs_attr_init(&node->sda.dev_attr.attr); + node->sda.dev_attr.attr.name = node->name; + node->sda.dev_attr.attr.mode = 0444; + fan_safe_attr_list[i] = &node->sda.dev_attr.attr; + } + fan_safe_attr_list[smcreg.fan_count] = NULL; + fan_safe_group.attrs = fan_safe_attr_list; + applesmc_extra_groups[0] = &fan_safe_group; + applesmc_extra_groups[1] = NULL; ret = applesmc_create_accelerometer(); if (ret) - goto out_temperature; + goto out_info; ret = applesmc_create_light_sensor(); if (ret) @@ -1363,7 +1528,8 @@ static int __init applesmc_init(void) if (ret) goto out_light_sysfs; - hwmon_dev = hwmon_device_register(&pdev->dev); + hwmon_dev = hwmon_device_register_with_info(&pdev->dev, "applesmc", NULL, + chip, applesmc_extra_groups); if (IS_ERR(hwmon_dev)) { ret = PTR_ERR(hwmon_dev); goto out_light_ledclass; @@ -1377,10 +1543,6 @@ static int __init applesmc_init(void) applesmc_release_light_sensor(); out_accelerometer: applesmc_release_accelerometer(); -out_temperature: - applesmc_destroy_nodes(temp_group); -out_fans: - applesmc_destroy_nodes(fan_group); out_info: applesmc_destroy_nodes(info_group); out_smcreg: @@ -1402,8 +1564,6 @@ static void __exit applesmc_exit(void) applesmc_release_key_backlight(); applesmc_release_light_sensor(); applesmc_release_accelerometer(); - applesmc_destroy_nodes(temp_group); - applesmc_destroy_nodes(fan_group); applesmc_destroy_nodes(info_group); applesmc_destroy_smcreg(); platform_device_unregister(pdev); -- 2.39.5